Control of electronic properties by lanthanide size and manganese oxidation state in the MnIII/MnIV Ruddlesden–Popper phases Ln2?xSr1+xMn2O7

Battle, Peter D. and Green, M.A. and Laskey, N. Scott and Kasmir, Nicholas and Millburn, Julie E. and Spring, Lauren E. and Sullivan, Stuart P. and Rosseinsky, Matthew J. and Vente, Jaap F. (1997) Control of electronic properties by lanthanide size and manganese oxidation state in the MnIII/MnIV Ruddlesden–Popper phases Ln2?xSr1+xMn2O7. Journal of Materials Chemistry, 7 (6). pp. 977-988. ISSN 0959-9428. (doi:https://doi.org/10.1039/A608501F) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://www.dx.doi.org/10.1039/A608501F

Abstract

The magnetic behaviour of then=2 Ruddlesden–Popper phases Sr2 LnMn2 O7 is very sensitive to the Ln3+ lanthanide cation. In samples with larger, more basic lanthanide cations (Ln=Nd, Pr) antiferromagnetic phases with ordering temperatures in the region of 130 K co-exist with phases showing a magnetic response suggestive of superparamagnetism or the development of small ferromagnetic clusters at high temperature. The magnetic transition temperature drops to 20 K in samples containing smaller, acidic cations (Ln=Gd–Er, Y). In the latter group of compounds, the transition is from a Curie–Weiss paramagnet to a spin-glass; there is no evidence for long-range magnetic order. This change in behaviour can be explained by considering the variation in the relative strength of superexchange and double exchange interactions as a function of the lanthanide cation. The influence of manganese oxidation state on magnetic response is investigated in the Sr2-x Ln1+x Mn2 O7 composition range (0.0?x?0.7) for Ln=Nd, Tb.

Item Type: Article
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Mark Green
Date Deposited: 19 Oct 2015 14:40 UTC
Last Modified: 25 Aug 2017 11:53 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51086 (The current URI for this page, for reference purposes)
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